PDF schematic labelled R9600L, only 46 KB in size, which suggests a short document of a few pages or a partial circuit rather than a full board set. The name gives no brand, board number or revision, so the exact product it covers must be confirmed by comparing part designators and connector layouts with the actual board. Even a small schematic can help trace a specific rail or signal path, but check the content in any PDF reader first and verify it matches the hardware on your bench.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @pepeelectronica. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.